Ultrahigh-speed photography of 44,000 frames/s was used to investigate the capacitor discharge welding (CDW) process. The objective of the study was to use high-speed photography and a finite element computer program to help describe the heat flow characteristics of the CDW cycle. The photos revealed that the plasma jet from the cathode was responsible for expelling metal from the anode rather than being squeezed out on contact. Photographic evidence suggested that the unequal anode/cathode heating ratio is primarily due to heat transfer from the anode to the expelled metal particles.
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